<template>
	<view class="navTabBox">
		<view class="longTab" :style='"width:"+mainWidth+"px"'>
			<scroll-view scroll-x="true" style="white-space: nowrap; display: flex;" scroll-with-animation :scroll-left="tabLeft" show-scrollbar="true">
				<view class="longItem" :style='"width:"+isWidth+"px"' :data-index="index" :class="index===tabClick?'click':''" v-for="(item,index) in tabTitle" :key="index" :id="'id'+index" @click="longClick(index,item.category_id,item.pid)">{{item.category_name}}</view>
				<view class="underlineBox" :style='"transform:translateX("+isLeft+"px);width:"+isWidth+"px"'>
					<view class="underline bg-color-red"></view>
				</view>
			</scroll-view>
		</view>
		
	</view>
</template>

<script>

	let app = getApp();
	export default {
		name: 'navTab',
		props: {
			tabTitle: {
				type: Array,
				default: []
			}

		},
		data() {
			return {
				tabClick: 0, //导航栏被点击
				isLeft: 0, //导航栏下划线位置
				isWidth: 0, //每个导航栏占位
				mainWidth: 0,
				tabLeft:0,
				swiperIndex:0,
				childIndex:0,
				childID:0
			};
		},
		created() {
			
			var that = this
			// 获取设备宽度
			uni.getSystemInfo({
				success(e) {					
					that.mainWidth = e.windowWidth 
					that.isWidth = (e.windowWidth-65) / 4 
				}
			})
		},
		methods: {
			// 导航栏点击
			longClick(index,id,fid){
				app.globalData.fid = fid;
				this.childIndex = 0;
				if(this.tabTitle.length>3){
					var tempIndex = index - 2;
					tempIndex = tempIndex<=0 ? 0 : tempIndex;
					this.tabLeft = (index-2) * this.isWidth //设置下划线位置
				}
				this.tabClick = index //设置导航点击了哪一个
				this.isLeft = index * this.isWidth //设置下划线位置
				
				// let obj = {
				// 	type:'big',  //大标题
				// 	index:index
				// }
				let obj = {
					index:index,
					pid:id//自己的id
				}
				
				this.parentEmit(obj);
				
				// this.$parent.currentTab = index //设置swiper的第几页
			},
			// 导航子类点击
			// childTab(tabClick,index){
			// 	this.childIndex = index
			// 	let obj = {
			// 		parentIndex:tabClick,
			// 		childIndex:index,
			// 		type:'small' //小标题
			// 	}
			// 	this.parentEmit(obj)
			// }
			parentEmit(obj){
				this.$emit('changeTab', obj);
			}
		}
	}
</script>

<style lang="scss">
	.navTabBox {
		width: 100%;
		color: rgba(255, 255, 255, 1);
		position: relative;
		.click {
			color: white;
		}
		.longTab {
			// width: 100%;
			/* #ifdef H5 */
			padding-bottom: 20rpx;
			/* #endif */
			/* #ifdef MP || APP-PLUS */
			padding-top: 12rpx;
			padding-bottom: 12rpx;
			/* #endif */
			.longItem{ 
				height: 50upx; 
				display: inline-block;
				line-height: 50upx;
				text-align: center;
				font-size: 28rpx;
				color: #333333;
				max-width: 160rpx;
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
				&.click{
					font-weight: bold;
					font-size: 30rpx;
					color: #333333;
				}
			}
			.underlineBox {
				height: 3px;
				width: 20%;
				display: flex;
				align-content: center;
				justify-content: center;
				transition: .5s;
				.underline {
					width: 100rpx;
					height: 10rpx;
				}
			}
		}
		.category{
			position: absolute;
			right: 0;
			width: 132rpx;
			
			/* #ifdef H5 */
			top: 25rpx;
			/* #endif */
			/* #ifdef MP || APP-PLUS */
			top: 16rpx;
			/* #endif */
			height: 50upx;
			line-height: 50upx;
			z-index: 3;
			color: #282828;
			padding: 0 15rpx 0 25rpx;
			background-size: 100% 100%;
			background-repeat: no-repeat;
			.iconfont{
				font-size: 30rpx;
				margin-right:6rpx;
			}
		}
	}
	.bg-color-red{
		background: #fa2a17;
	}
	.child-box{
		width: 100%;
		position: relative;
		// height: 152rpx;
		background-color: #fff;
		/* #ifdef H5 */
		box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.02);
		/* #endif */
		/* #ifdef MP */
		box-shadow: 0 2rpx 3rpx 1rpx #FA9059;
		/* #endif */
		
		.wrapper{
			display: flex;
			align-items: center;
			padding: 20rpx 0;
			background: #fff;
			/* #ifdef H5 */
			//box-shadow: 0 2px 5px 1px rgba(0, 0, 0, 0.06);
			/* #endif */
		}
		.child-item{
			flex-shrink: 0;
			width:140rpx;
			display: flex;
			flex-direction: column;
			align-items: center;
			justify-content: center;
			margin-left: 10rpx;
			image{
				width: 90rpx;
				height: 90rpx;
				border-radius: 50%;
			}
			.txt{
				font-size: 24rpx;
				color: #282828;
				text-align: center;
				margin-top: 10rpx;
			}
			&.on{
				image{
					border: 1px solid #FA9059;
				}
				.txt{
					color: #333333;
				}
			}
		}
	}
</style>
